Lithium ion battery and electrolyte thereof

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of aggravating battery safety risks, battery thickness expansion, etc., and achieve the effect of improving the interface, reducing production, and reducing decomposition

Active Publication Date: 2011-11-16
DONGGUAN AMPEREX TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the high voltage state of lithium-ion batteries, the oxidation ability of the positive electrode is enhanced, and the electrolyte solvent is oxidized on the positive

Method used

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  • Lithium ion battery and electrolyte thereof
  • Lithium ion battery and electrolyte thereof
  • Lithium ion battery and electrolyte thereof

Examples

Experimental program
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Embodiment Construction

[0018] The present invention will be described in further detail below in combination with examples and test results, but the embodiments of the present invention are not limited thereto.

[0019] battery production

[0020] Positive electrode preparation: positive electrode material ratio is: lithium cobaltate (LiCoO2, positive electrode active material, weight percent 94%), acetylene black (conductive material, weight percent 3%), polyvinylidene fluoride (PVDF, binding agent, weight percent percentage 3%). Add PVDF into N-methylpyrrolidone and stir with a high-speed mixer to completely dissolve the polymer and form a uniform solution. Add acetylene black to this solution, stir and disperse evenly; then add LiCoO2, stir and disperse to form a uniform cathode slurry. The slurry is coated on the aluminum foil current collector, the solvent is dried, the pole piece is compacted, and the pieces are cut to obtain the unit positive pole piece.

[0021] Negative electrode prepara...

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PUM

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Abstract

The invention discloses lithium ion battery electrolyte. The lithium ion battery electrolyte comprises a solvent, lithium salt and additives; the methyl-containing chain carbonate ester in the solvent is less than or equal to 5 percent of the total mass of the solvent; and the additives comprise 2 to 4 percent of 1,3-propane sultone (PS). Compared with the prior art, the lithium ion battery electrolyte has the advantages that: the content of the methyl-containing chain carbonate ester with low stability in the solvent is controlled, and the additives, namely the 1,3-propane sultone, butanedinitrile, adiponitrile, vinylene carbonate (VC), fluoroethylene carbonate (FEC) and the like are added into the solvent, so that an interface of an electrode/the electrolyte can be improved, the decomposition of the solvent in the electrolyte is reduced, the quantity of gas generated in the battery is reduced, and the high temperature storage performance, the safety performance and the cycle performance of the battery under a high voltage are improved. Besides, the invention also provides a lithium ion battery employing the electrolyte.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to an electrolyte that can significantly improve the high-temperature storage performance and safety performance of the lithium-ion battery under high-voltage conditions and a lithium-ion battery using the electrolyte. Background technique [0002] In recent years, lithium-ion batteries have been widely used in small electronic devices such as digital cameras and notebook computers due to their high energy density, high voltage, low self-discharge rate, and light weight. With the deepening of the application of lithium-ion batteries, people put forward higher and higher requirements for their safety performance and energy density. [0003] The cut-off voltage of the current full charge of the lithium-ion battery is 4.2V. If the upper limit voltage of the lithium-ion battery can be increased, the energy density of the battery can be significantly improved. However, when lithium-...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 付成华许瑞赵丰刚韩昌隆
Owner DONGGUAN AMPEREX TECH
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